The Metso Outotec LSF filter is used to remove and recover solids in low concentrations from process liquids. The quality of the resulting filtrate increases production capacity while boosting the quality of plant and refinery products.
Metso Outotec LSF filters exploit the phenomena of adsorption filtration to cause micronic and sub-micronic particles to adhere to the fibers of the filter, despite being small enough to pass through its pores. This activity reduces particle concentration in the filtrate to almost undetectable levels. Filter aids such as precoat and body feeds are unnecessary in the vast majority of applications, but if required, the filter can be operated with a filter aid without needing modification.
With filtration areas available up to 720 m², process flow sheets can be simplified by installing a reduced number of filters. Our LSF filters are manufactured in materials that are resistant to highly corrosive solutions and high process temperatures.
During filtration, the process liquid is fed to the vessel and liquid passes through the cloth at a low velocity, leaving the particles on the fabric and only allowing clear filtrate to pass through. Pumping at constant flux, the initial pressure is low and this slowly increases as a cake builds on the elements.
All models feature a unique, fully programmable cloth cleaning and cake discharge system. The cake solids settle in the conical bottom with multiple filtration cycles for each wet cake discharge. Once the vessel pressure reaches the maximum, a discharge and cloth washing sequence is initiated to remove the accumulated solids and clean the cloth before refilling and resuming the next filtration sequence.